(3)The Auditor of Indian Home Accounts shall perform such duties and exercise such powers in relation to transactions in the United Kingdom affecting the revenues of the Federation, of the Federal Railway Authority, or of any Province, as may be prescribed by, or by rules made under, an Order of His Majesty in Council, or by any Act of the Federal Legislature varying or extending such an Order:Provided that no Bill or amendment for the purpose aforesaid shall be introduced or moved without the prior sanction of the Governor-General in his discretion.